Their Elasticsearch type mapping shows they're using the English fulltext analyzer for message content, I'm curious if they're planning on supporting fulltext search for other languages in the future.
Maybe one day. It'd be trivial to add per-locale templates. The hard part really is exposing that in our new guild flow (hey - what language is this server gonna be in) - and also handling if someone chooses to change their server language (this would have to trigger a re-index). We'd also have to replicate those language analyzers in our client to do proper highlighting.